Whilst this is a photo copy, and some of the pages are a little askew, it was all readable and intact. A real bonus finding an old manual for a classic piece of kit that no other site had.
It was easy done, and I got exactly what I was looking for.
Text excerpt from page 37 (click to view)
3.Press the button marked " M" (memory), display "M" and suggested preset number will flash for 12 seconds. If preset 1 and 2 have been stored, it will suggest preset 3 at this stage, on display preset 3 will flash.
4.Press "ENTER" button and your station will be stored in that memory position.